135 Fuel
S/N 250 and up should have 49kg in the LH Supply Tank and 44.5kg in the RH Supply Tank - the Main tank transfer pumps will keep that amount in the supply tanks until it is empty.
This would indicate that the main tank was empty and the supply tanks were being depleted to keep the engines running.
Prolonged hovering can also result in up to 71kg unusable fuel in the main tank. The quantity of unusable fuel can be reduced to 7.5 kg when flying with 80 KIAS or more.